Improvement in limekilns



E., e., ENGLISH;

Lime Kiln.

Patented Feb. 23, 1864.

UNITED STATES PATENT OFFICE. A

EDWARD B. ENGLISH, 0F PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN LIMEKILNS.

Specification forming part of Letters Patent No. 41,691, dated February 23, 1864.

.To all whom it may concern.-

Be it known that I, EDWARD B. ENGLISH, of Philadelphia, Pennsylvania, have invented an Improvement in Limekilns; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

My invention relates to improvements, fully described hereinafter, in the lime-kiln for which Letters Patent were granted to Richard Donaldson on the 19th day of February, 1860, said Letters Patent having been reissued on the 19th day of May, 1863.

In order to enable others familar with the construction of limekilns to make and use my invention, I will now proceed to describe its construction and operation.

On reference to the accompanying drawings, which form a part of this specification, Figure 1 is a sectional elevation of my improved limekiln; Fig. 2, a vertical section on the line 1 2, Fig. l; Fig. 3, a transverse section on the line 3 4, Fig. l; and Fig. 4, a plan view.

Similarletters referto similar parts throughout the several views.

A is the body of the kiln, on the top of which is the chimney B. Through the lower part of the body A passes the arched way c, at right angles to which is a similar arched way, c', these two arched ways permitting free access to the funnel-shaped cooler G, from which the burnt lime is discharged. In the interior of the kiln are two chambers, the lower chamber, W, being square, and the upper and narrower chamber, X, oblong, as shown in dotted lines, Fig. 3, the corners of both chambers being rounded, for a purpose described hereinafter. e

At the upper part of the chamber X, which decreases above the line 2 2 until it correspondspin size with the interior ofthe chimney B, is a sliding damper, a, and below the damper is an opening, E, through which the limestone is thrown into the kiln, this opening being provided with a door, b.

The kiln is charged and started in the same manner as is described in the reissued patent of R. Donaldson, before referred to, the sliding damper c being open during the process of burning the lime, and until it is required to withdraw a portion of the same from the v cooler G, when the damper is moved forward so as to close the chimney and prevent the cool air from passing through the cooler G upward into the kiln. When the burnt limestone is withdrawn, the damper :is again opened and the burning continued.

It will be seen that when the damper a is closed the heat in the kiln will be confined about the limestone, and its waste and dispersion to a great extent prevented. This waste of the heat occurs to a great extent when the burning is discontinued for several days, and when the damper is placed at the top of the chimney, as in Donaldsons patent kiln, in which the chimneyr is quickly cooled by the exterior air, and absorbs and gives oft the greater portion of the heat in the kiln-an evil which this portion of my invention has been Vespecially designed to obviate.

In kilns as generally' constructed the angular corners of the chambers are not filled by the limestone, and consequently the heat escapes too rapidly at these points, and reaches the chimney without sufficiently penetrating the body of the limestone. By making the corners of the chambers round, as in the present instance, the limestone can be as close to the interior of the kiln at these points as against the sides, and the above-mentioned diltculty is obviated.

It will be seen that the chamber W, into which the products of combustion first pass, is much larger than the upper chamber, X, and will consequently contain so large a body of heat that it is not possible for the latter to pass upward without coming in intimate contact with every particle of limestone in the kiln.

By gradually increasing the width of the replaces F from the doors until they equal that of the cham ber WV, a small quantity of fuel may be use-d, and at the same time a thorough dispersion of the heat through the limestone be effected. A great advantage is also gained by making the top of the lire-places of the arched form represented, thereby dispensing with the ordinary supporting-pillars, which so divide the products of combustion that much of the limestone :is insufficiently burned.

I claim as my invention and desire to secure by Letters Patent, as 'an improvement on the verginsides, when combined with the chamssbid patent of 1%.Donaidsonber W, as and for the purpose described.

1. The arrangement, at or near the base of In testimony whereof I have signed my the chimney, of the damper a or its equivaname to this specification in the presence of lent, as and for the purpose set forth. two subscribing Witnesses.

2. The chambers W and X, When formed EDW. B. ENGLISH. and arranged in respect to eaeh other as and Witnesses: for the purpose specified. HENRY HoWsoN,

3. The {ire-places F and F,with their dip CHARLES E. FOSTER. 

